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low cost, high speed rail-to-rail output op amp ada4851-1 rev. 0 in fo rmation furn is h e d by an al o g dev i ces is believed to be a ccu rate and r e liable. how e ver, no r e spons i bili ty is assumed by analog devices fo r its use, nor f o r an y i n fri n geme nt s of p a t e nt s or ot her ri g h t s o f th ird parties th at may result fro m its use . specifications subject to chan g e witho u t n o tice. no licen s e is g r an te d by implicati o n or ot he rwi s e un der a n y p a t e nt or p a t e nt r i ghts of anal og de vices. trad emarks an d registered tra d ema r ks are the prop erty o f their respective ow ners. one technolog y way, p.o . box 9106, norwood, ma 02062-9106, u.s.a. t e l: 781. 329. 4 700 www.analog.com fax: 781. 326. 87 03 ? 2004 analog de vices, i n c. al l r i ght s r e ser v ed . fea t ures high speed 130 mh z ? 3 db bandwidth 800 v/s s l ew r a te 85 ns sett ling ti me to 0.1% fully specified at +3 v, +5 v, a n d 5 v s u pplies single-supply operation output swings to within 70 m v of either r a il rail-to-rail out p ut 0.1 db fl atness: 14 mh z differentia l gai n : 0.04% differentia l ph ase: 0.0 6 low voltage offset: 0.6 mv wide s u pply ra nge: 3 v to 1 0 v low power: 2.5 ma power-down mode avail a ble in sp ace-saving pac k age: sot-23 -6 applic a t io ns consumer vi de o professional vi deo video switcher s active fi lters pin c o nfig ur a t ion v out 1 +in 3 2 ada4851-1 top view (not to scale) ?v s +v s 6 ?in 4 5 power down 05143-001 f i g u re 1. 6-l e ad s o t - 23 (r j- 6) gener a l description the ad a4851 -1 is a lo w cos t , hig h s p ee d , v o l t ag e f eed bac k ra il-t o-ra il o u t p u t o p a m p . desp i t e i t s lo w p r ic e , th e ad a4851 -1 p r o v ides exce l l en t o v eral l p e r f o r ma n c e and v e rs a t i l i t y . th e 130 mh z ?3 db ba ndwid th and 800 v/s s l e w ra t e mak e this a m p l if ier w e ll-sui t e d f o r ma n y g e n e ral-p u r p ose , high sp ee d ap p l i c at i o n s . th e ad a4851-1 is d e si g n ed t o o p era t e a t s u p p l y v o l t a g es as l o w a s 3 v a n d u p t o 5 v u s in g o n l y 2 . 5 ma o f s u p p l y c u rr en t. t o fu r t h e r r e d u ce po w e r co n s um p t io n, t h e a m plif i e r is e q ui p p e d wi t h a p o w e r - do wn m o de, w h ich lo w e rs t h e su p p l y c u r r en t to 0.2 ma. th e ad a 4 85 1- 1 p r o v id e s u s e r s wi th a tr u e s i n g le -s u p p l y c a p a b i l i ty , a l low i n g i n put s i g n a l s t o ex t e nd 20 0 mv b e lo w t h e n e ga ti v e ra il a n d t o wi thin 2 v o f t h e posi ti v e ra il . on t h e o u t p u t , t h e am plif ier c a n s w ing w i t h in 70 m v o f e i t h er sup p ly rai l . w i t h i t s com b ina t io n o f lo w p r ice , exce l l en t dif f er en t i a l ga in (0.04%), dif f er en tial p h ase (0.0 6o), a n d 0.1 d b f l a t n e s s o u t t o 14 mh z, t h is am plif ier is ide a l fo r co n s um er vi de o a p pli c a t ions. the ad a4851 -1 is a v a i la b l e in a sot - 23-6 p a cka g e an d is desig n e d t o w o rk in t h e extende d t e m p er a t ur e r a n g e (?40c t o +125c). closed-loop gain (db) 1 100 10 1k 05143-004 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 4 3 g = +1 v s = 2.5v r l = 1k ? c l = 5pf fi g u r e 2 . s m a l l s i g n a l fr e q u e n c y r e s p o n s e
ada4851-1 rev. 0 | page 2 of 16 table of contents specifications..................................................................................... 3 specifications with +3 v supply ................................................. 3 specifications with +5 v supply ................................................. 4 specifications with 5 v supply ................................................. 5 absolute maximum ratings............................................................ 6 thermal resistance ...................................................................... 6 esd caution.................................................................................. 6 typical performance characteristics ..............................................7 circuit description......................................................................... 13 headroom considerations........................................................ 13 overload behavior and recovery ............................................ 14 outline dimensions ....................................................................... 15 ordering guide .......................................................................... 15 revision history 10/04revision 0: initial version
ada4851-1 rev. 0 | page 3 of 16 specifications specifications with +3 v supply t a = 25c, r f = 0 ? for g = +1, r f = 1 k? for g > +1, r l = 1 k?, unless otherwise noted. table 1. parameter conditions min typ max unit dynamic performance ?3 db bandwidth g = +1, v o = 0.1 v p-p 112 130 mhz g = +1, v o = 1 v p-p 54 65 mhz bandwidth for 0.1 db flatness g = +2, v o = 0.5 v p-p, r l = 150 ? 20 mhz slew rate g = +2, v o = 2 v step 140 v/s noise/distortion performance harmonic distortion (dbc) hd2/hd3 f c = 1 mhz, v o = 0.2 v p-p, g = +2 ?85/?113 dbc input voltage noise f = 100 khz 10 nv/hz input current noise f = 100 khz 2.5 pa/hz dc performance input offset voltage 0.6 3.3 mv input offset voltage drift 4 v/c input bias current 1.8 3.7 a input bias current drift 6 na/c input bias offset current 20 na open-loop gain v o = 2 v to 3 v 83 102 db input characteristics input resistance differential/ common-mode 0.5/5.0 m? input capacitance 1.2 pf input common-mode voltage range ?0.2 to +0.8 v input overdrive recovery time (rise/fall) v in = +3.5 v, ?0.5 v, g = +1 60/60 ns common-mode rejection ratio v cm = 0.5 v ?81 ?118 db power-down power-down input voltage power-down < 1.1 v turn-off time 0.7 s turn-on time 60 ns power-down bias current enabled power-down = 3 v +4 +6 a power-down power-down = 0 v ?14 ?20 a output characteristics output overdrive recovery time (rise/fall) v in = +0.7 v, ?0.1 v, g = +5 70/100 ns output voltage swing 0.05 to 2.92 0.02 to 2.94 v short-circuit current sinking/sourcing 90/70 ma power supply operating range 3 12 v quiescent current 2.4 2.7 ma quiescent current (power-down) power-down = low 0.2 0.3 ma positive power supply rejection +v s = +2.5 v to +3.5 v, ?v s = ?0.5 v ?84 ?102 db negative power supply rejection +v s = +2.5 v,?v s = ?0.5 v to C1.5 v ?83 ?102 db
ada4851-1 rev. 0 | page 4 of 16 specifications with +5 v supply t a = 25c, r f = 0 ? for g = +1, r f = 1 k? for g > +1, r l = 1 k?, unless otherwise noted. table 2. parameter conditions min typ max unit dynamic performance ?3 db bandwidth g = +1, v o = 0.1 v p-p 107 125 mhz g = +1, v o = 1 v p-p 54 65 mhz bandwidth for 0.1 db flatness g = +2, v o = 2 v p-p, r l = 150 ? 15 mhz slew rate g = +2, v o = 3 v step 410 v/s settling time to 0.1% g = +2, v o = 1 v step, r l = 150 ? 85 ns noise/distortion performance harmonic distortion (dbc) hd2/hd3 f c = 1 mhz, v o = 0.2 v p-p, g = +2 ?98/?113 dbc input voltage noise f = 100 khz 10 nv/hz input current noise f = 100 khz 2.5 pa/hz differential gain g = +2, ntsc, r l = 150 ? 0.05 % differential phase g = +2, ntsc, r l = 150 ? 0.09 degrees dc performance input offset voltage 0.6 3.4 mv input offset voltage drift 4 v/c input bias current 1.7 3.6 a input bias current drift 6 na/c input bias offset current 20 na open-loop gain v o = 1 v to 4 v 97 111 db input characteristics input resistance differential/ common-mode 0.5/5.0 m? input capacitance 1.2 pf input common-mode voltage range ?0.2 to +2.8 v input overdrive recovery time (rise/fall) v in = +5.5 v, ?0.5 v, g = +1 50/45 ns common-mode rejection ratio v cm = 2 v ?88 ?130 db power-down power-down input voltage power-down < 1.1 v turn-off time 0.7 s turn-on time 50 ns power-down bias current enabled power-down = 5 v 33 40 a power-down power-down = 0 v ?22 ?30 a output characteristics output overdrive recovery time (rise/fall) v in = +1.1 v, ?0.1 v, g = +5 60/70 ns output voltage swing 0.09 to 4.92 0.05 to 4.94 v short-circuit current sinking/sourcing 110/90 ma power supply operating range 3 12 v quiescent current 2.5 2.8 ma quiescent current (power-down) power-down = low 0.2 0.3 ma positive power supply rejection +v s = +5 v to +6 v, ?v s = 0 v ?85 ?101 db negative power supply rejection +v s = +5 v,?v s = ?0 v to ?1 v ?84 ?101 db
ada4851-1 rev. 0 | page 5 of 16 specifications with 5 v supply t a = 25c, r f = 0 ? for g = +1, r f = 1 k? for g > +1, r l = 1 k?, unless otherwise noted. table 3. parameter conditions min typ max unit dynamic performance ?3 db bandwidth g = +1, v o = 0.1 v p-p 43 105 mhz g = +1, v o = 1 v p-p 64 78 mhz bandwidth for 0.1 db flatness g = +2, v o = 2 v p-p, r l = 150 ? 14 mhz slew rate g = +2, v o = 8 v p-p step 800 v/s g = +2, v o = 2 v p-p step 400 v/s settling time to 0.1% g = +2, v o = 2 v step, r l = 150 ? 90 ns noise/distortion performance harmonic distortion (dbc) hd2/hd3 f c = 1 mhz, v o = 1 v p-p, g = +1 ?90/?117 dbc input voltage noise f = 100 khz 10 nv/hz input current noise f = 100 khz 2.5 pa/hz differential gain g = +2, ntsc, r l = 150 ? 0.04 % differential phase g = +2, ntsc, r l = 150 ? 0.06 degrees dc performance input offset voltage 0.6 3.5 mv input offset voltage drift 4 v/c input bias current 1.7 3.7 a input bias current drift 6 na/c input bias offset current 20 na open-loop gain v o = 2.5 v 99 111 db input characteristics input resistance differential/ common-mode 0.5/5.0 m? input capacitance 1.2 pf input common-mode voltage range ?5.2 to +2.8 v input overdrive recovery time (rise/fall) v in = 6 v, g = +1 50/25 ns common-mode rejection ratio v cm = 4 v ?91 ?123 db power-down power-down input voltage power-down < ?3.9 v turn-off time 0.7 s turn-on time 30 ns power-down bias current enabled power-down = +5 v 0.1 0.13 ma power-down power-down = ?5 v ?0.05 ?0.06 ma output characteristics output overdrive recovery time (rise/fall) v in = 1.2 v, g = +5 80/50 ns output voltage swing ?4.9 to +4.91 ?4.93 to +4.93 v short-circuit current sinking/sourcing 125/110 ma power supply operating range 1.5 6 v quiescent current 2.9 3.2 ma quiescent current (power-down) power-down = low 0.2 0.3 ma positive power supply rejection +v s = +5 v to +6 v, ?v s = ?5 v ?85 ?102 db negative power supply rejection +v s = +5 v,?v s = ?5 v to ?6 v ?84 ?102 db
ada4851-1 rev. 0 | page 6 of 1 6 absolute maximum ratings table 4. p a r a m e t e r r a t i n g supply voltage 12.6 v power dissi pati on see figure 3 common-mode input vol t age ? v s ? 0.5 v to +v s + 0.5 v differential input voltage +v s to ?v s storage temperature ?65c to +125c operating tem p erature range ?40c to +125c lead temperature range (sol dering 10 s e c) 300c junction tempe r ature 150c s t r e s s es a b o v e t h os e lis t e d u n de r a b s o l u t e m a xi m u m r a t i n g s ma y c a us e p e r m a n en t dama ge t o t h e de vice . this is a s t r e s s ra t i n g onl y ; f u n c t i o n al o p era t ion o f t h e de vice a t t h es e o r an y o t h e r con d i t io ns a b o v e t h o s e i ndic a te d i n t h e op er a t io na l s e c t io n o f t h is sp e c if ic a t io n is no t im plie d . e x p o sur e t o a b s o l u te max i m u m ra t i ng co ndi t i on s fo r ex ten d e d p e r i o d s ma y a f fe c t de vice r e l i ab i l i t y . thermal resistance ja is sp e c if ie d fo r t h e w o rst - ca s e co ndi t i on s, i . e. , ja is sp e c if ie d f o r d e v i ce so l d er ed i n ci r c ui t boa r d f o r s u rfa c e - m o un t pa c k a g es . table 5. therm a l resistance package type ja u n i t s o t - 2 3 - 6 1 7 0 c / w maximum power dissipation the maxim u m s a f e p o w e r dis s i p a t io n f o r the ad a4851-1 is l i m i t e d b y t h e as soc i a t ed ri se in j u n c ti o n t e m p era t u r e (t j ) o n t h e d i e. a t a ppro x i m a t ely 1 5 0 c, w h ich is t h e g l ass t r an si t i on t e m p era t ur e , t h e plas t i c cha n g e s i t s p r o p er t i es. e v en t e m p o r a r i l y exce e d in g t h is tem p er a t ur e li mi t ma y cha n ge t h e s t r e s s es t h a t th e pa ck a g e e x er t s o n th e d i e , p e rm a n en tl y s h i f ti n g t h e p a ra m e tr ic p e r f o r ma n c e o f t h e ad a4851 -1. e x ceedin g a j u n c tion t e m p er a t ur e o f 150c fo r a n ext e n d e d p e r i o d o f tim e ca n r e su l t in ch a n ges in si li co n de vices, p o ten t i a l l y ca usin g d e g r a d a t i o n or l o ss of f u nc t i on a l it y . the p o w e r dis s i p a t e d in t h e p a cka g e (p d ) i s th e s u m o f th e q u ies c en t p o w e r dissi p a t ion and t h e p o w e r dissi p a te d i n t h e di e d u e t o t h e ad a4851-1 dr i v e a t th e o u t p u t . th e q u ies c en t p o w e r is t h e v o l t a g e b e tw e e n t h e s u p p ly p i n s (v s ) ti m e s th e q u i e sce n t cu rr e n t ( i s ). p d = qu i e sc e n t p o w e r + ( to t a l d r i v e p o w e r ? lo ad p o wer ) () l out l out s s s d r v r v v i v p 2 C 2 ? ? ? ? ? ? + = r m s output vo lt age s s h ou l d b e c o ns i d e r e d . i f r l i s re f e re nc e d t o ? v s , as in sin g le -s u p ply o p er a t i o n, t h e t o t a l dr iv e p o w e r is v s i ou t . i f t h e r m s sig n al le v e l s a r e indet e r m ina t e , co n s ider t h e worst c a s e , w h e n v ou t = v s /4 fo r r l to mi dsupp l y . () ( ) l s s s d r v i v p 2 4 / + = in s i n g l e - s u p p l y o p e r at i o n w i t h r l re f e re nc e d to ? v s , w o r s t c a s e is v ou t = v s /2. a i r f l o w i n c r e a s e s h e at d i s s i p at i o n , e f f e c t i v e l y r e d u c i n g ja . a l s o , m o r e met a l dir e c t ly in con t ac t w i t h t h e p a cka g e le ads and e x posed pa d d le f r o m m e tal tra c e s , th r o u g h h o le s , gr o u n d , a n d po w e r p l a n e s r e d u c e ja . f i gur e 3 sh o w s t h e maxi m u m s a fe p o w e r dissi p a t io n in t h e p a cka g e v s . t h e a m b i e n t tem p era t ur e fo r t h e sot - 23 -6 (170c/w ) p a c k a g e on a jed e c s t anda r d 4 - l a yer bo a r d . ja val u es a r e a p p r o x ima t io n s . 0.2 0.4 0.6 0.8 m a xi m u m po wer di ssi pat i o n (w) 1.0 1.2 1.4 ?40 ? 20 0 2 0 4 0 6 0 8 0 100 120 ambient temperature ( c) 05143-048 0 f i g u re 3. m a x i m u m p o wer d i s s i pat i on v s . t e mpe r at u r e f o r a 4-laye r b o a r d esd caution esd (electrostatic discharge) sensitive device. ele c tr ostatic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharg e wit h out detection. althou gh this product features proprietary esd protection circu i try, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. theref ore, prop er esd precautions a r e recommended to avoid perform a nce degradation or l o ss of functiona l ity.
ada4851-1 rev. 0 | page 7 of 1 6 typical perf orm ance cha r acte ristics closed-loop gain (db) 1 100 10 05143-006 frequency (mhz) ?7 ?5 ?6 ?3 ?4 ?1 ?2 1 0 v s = 5v r l = 150 ? v out = 0.1v p-p g = ? 1 g = +2 g = +10 f i gur e 4 . sm al l si g n a l f r equenc y resp o n se f o r v a ri o u s g a i n s ?6 ?5 ?4 ?3 ?2 ?1 0 1 closed- l oop gain ( d b) 1 100 10 300 05143-009 frequency (mhz) v s = 5v g = +1 v out = 0.1v p-p r l = 150 ? r l = 1k ? f i g u re 5. s m a l l sig n al f r equenc y r e s p ons e f o r v a r i ous l o ads closed- l oop gain ( d b) 1 100 10 300 05143-007 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 g = +1 r l = 150 ? v out = 0.1v p-p v s = 2.5v v s = 5v f i g u re 6. s m a l l sig n al f r equenc y r e s p ons e f o r v a r i ous s u p p li es closed-loop gain (db) 1 100 10 300 05143-010 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 4 3 g = +1 v s = 2.5v r l = 1k ? v out = 0.1v p-p 10pf 5pf 0pf 10pf + 25 ? r snub r snub r l c l f i g u re 7. s m a l l sig n al f r equenc y r e s p ons e f o r v a r i ous ca pac i to r l o ads ?6 ?5 ?4 ?3 ?2 ?1 0 1 closed- l oop gain ( d b) 1 100 10 05143-008 frequency (mhz) ?40 c +25 c +85 c +125 c v s = 5v g = +1 v out = 0.1v p-p 300 f i g u re 8. s m a l l sig n al f r equenc y r e s p ons e f o r v a r i ous t e mpe r at u r es closed-loop gain (db) 1 100 10 05143-012 frequency (mhz) ?7 ?5 ?6 ?3 ?4 ?1 ?2 1 0 v s = 5v r l = 150 ? v out = 1v p-p g = +10 g = ? 1 g = +2 f i gur e 9 . lar g e si g n a l f r equenc y resp o n se f o r v a ri o u s g a i n s
ada4851-1 rev. 0 | page 8 of 1 6 closed-loop gain (db) 0.1 10 1 100 05143-021 frequency (mhz) 5.4 5.6 5.5 5.8 5.7 6.0 5.9 6.2 6.1 v s = 5v g = +2 r l = 150 ? v out = 1v p-p v out = 100mv p-p v out = 2v p-p f i g u re 10. 0. 1 db f l at nes s r e s p ons e ?6 ?5 ?4 ?3 ?2 ?1 0 1 closed- l oop gain ( d b) 1 100 10 300 05143-015 v s = 5v g = +1 v out = 1v p-p r l = 1k ? r l = 150 ? frequency (mhz) f i gur e 1 1 . la r g e f r equenc y respo n se fo r v a r i o u s l o a d s ?20 0 20 40 60 80 100 120 open- l oop gain ( d b) open - l oop ph a se ( d egrees) 100k 10 k 100 1k 10 1 m 10m 10 0m 1g frequency (hz) 05143-029 phase gain v s = 5v 140 ? 240 ? 210 ? 180 ? 150 ? 120 ?9 0 ?6 0 ?3 0 0 f i gure 12. o p en-l oop g a in and phase vs . f r equenc y ?120 ?110 ?100 ?90 ?80 ?70 ?60 ?50 harmonic dis t ortion (dbc ) 0.1 10 1 100 05143-014 frequency (mhz) g = +2 r l = 1k ? v out = 200mv p-p v s = +3v hd2 v s = 5v hd2 v s = +3v hd3 v s = 5v hd3 f i gur e 1 3 . ha rm onic di stor ti on vs . f r eque nc y fo r v a r i o u s suppli e s ?120 ?110 ?100 ?90 ?80 ?70 ?60 ? 50 harmonic dis t ortion (dbc ) 0 1 2 3 4 5 67 89 1 0 output amplitude (v p-p) 05143-017 g = +2 v s = 5v r l = 1k ? f = 2mhz hd2 hd3 f i gur e 1 4 . ha rm onic di stor ti on vs . output v o l t a g e ?120 ?110 ?100 ?90 ?80 ?70 ?60 ?50 harmonic dis t ortion (dbc ) 0.1 10 1 05143-016 frequency (mhz) g = +1 v s = 5v v out = 1v p-p r l = 150 ? hd2 r l = 1k ? hd2 r l = 150 ? hd3 r l = 1k ? hd3 f i gur e 1 5 . ha rm onic di stor ti on vs . f r eque nc y fo r v a r i o u s l o a d s
ada4851-1 rev. 0 | page 9 of 1 6 ?120 ?110 ?100 ?90 ?80 ?70 ?60 ?50 harmonic dis t ortion (dbc ) 0.1 10 1 100 05143-013 frequency (mhz) g = +1 v s = 5v r l = 1k ? v out = 2v p-p hd2 v out = 2v p-p hd3 v out = 200mv p-p hd2 v out = 200mv p-p hd3 f i gur e 1 6 . ha rm onic di stor ti on vs . f r eque nc y fo r v a r i o u s v ou t ?6 ?4 ?2 ?3 ?5 0 ?1 inp u t and outp ut v o ltage (v ) 2 1 4 3 6 5 0 100 200 300 400 500 600 700 800 900 1k time (ns) 05143-019 g = +5 v s = 5v r l = 150 ? f = 1mhz 5 input output f i gure 17. o u tput o v er dr ive r e c o ver y ?6 ?4 ?2 ?3 ?5 0 ?1 inp u t and outp ut v o ltage (v ) 2 1 4 3 6 5 0 100 200 300 400 500 600 700 800 900 1k time (ns) 05143-022 g = +1 v s = 5v r l = 150 ? f = 1mhz input output f i gure 18. input o v er dr ive r eco ver y ?0.075 ?0.050 ?0.025 0 0.025 0.050 0.075 output voltage (v) time (ns) 50 0 100 150 200 05143-024 v s = 2.5v v s = 5v g = +1 or +2 r l = 1k ? f i g u re 19. sm a ll s i g n al t r ans i ent r e s p ons e f o r v a r i ous s u p p l i es output voltage (v) 0 2 0 4 0 6 0 8 0 100 120 140 160 180 200 time (ns) 05143-026 ? 0.075 ? 0.050 ? 0.025 0.025 0.050 0.075 0 g = +1 v s = 2.5v r l = 150 ? 10pf 0pf f i g u re 20. sm a ll s i g n al t r ans i ent r e s p ons e f o r capa cit i ve l oad ? 1.5 ? 1.0 ? 0.5 0 0.5 1.0 1.5 output voltage for 5v su pply ( v ) ?2.5 ?2.0 ?1.5 ?1.0 ?0.5 0 0.5 output voltage for 2.5v su pply ( v ) time (ns) 50 0 100 150 200 05143-028 v s = 2.5v v s = 5v g = +2 r l = 150 ? f i g u re 21. lar g e s i g n al t r ans i ent r e s p ons e f o r v a r i ous s u p p l i es
ada4851-1 rev. 0 | page 10 of 16 ?1.5 ?1.0 ?0.5 0 0.5 1.0 1.5 output voltage for 5v su pply ( v ) ?2.5 ?2.0 ?1.5 ?1.0 ?0.5 0 0.5 output voltage for 2.5v su pply ( v ) time (ns) 50 0 100 150 200 05143-027 v s = 2.5v v s = 5v g = +2 r l = 150 ? f i g u re 22. lar g e s i g n al t r ans i ent r e s p ons e f o r v a r i ous s u p p l i es 0 0.1 0.2 0.3 0.4 0.5 0 5 10 15 20 25 30 35 voltage differential from v s (v ) 05143-049 load current (ma) +v s ? v out v s = +3v v s = 5v ?v s ? v out f i g u re 23. o u t p ut s a t u r a t i on v o lt ag e v s . l oad cur r ent 0 400 800 600 200 1.2k 1.0k slew r a t e ( v / s) 0 1 2 3 456 7 8 9 output voltage step (v p-p) 05143-032 g = +2 v s = 5v r l = 1k ? 25% to 75% of v o 10 positive slew rate negative slew rate f i gure 2 4 . slew ra te vs . o u tput v o l t a g e ?1 0 1 2 3 4 5 6 volta g e ( v ) 03 0 15 45 05143-033 time ( s) g = +2 v s = 5v f in = 400khz v out v disable f i g u re 25. e n ab le/ d is abl e ti me 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 s u p p l y curre nt (ma) ?5 ? 4 ?3 ?2 ?1 0 1 2 3 4 5 disable voltage (v) 05143-034 v s = 5v v s = 2.5v v s = +3v f i gure 26. sup p l y current v s . po we r do wn pi n v o l t a g e in pu t offset volta ge ( v) temperature ( c) 05143-035 ?40 ? 25 ?10 5 20 35 50 65 80 95 110 125 ? 400 ? 300 ? 200 ? 100 0 100 200 300 v s = 5v v s = 2.5v v s = +3v f i gure 27. input o f f s et v o ltag e v s . t e m p er atu r e for v a r i ou s sup p l i es
ada4851-1 rev. 0 | page 11 of 16 inp u t bias curre nt ( a) temperature ( c) 05143-036 1.2 1.4 1.6 1.8 2.0 2.2 ?40 ? 25 ?10 5 20 35 50 65 80 95 110 125 i b +, v s = 2.5v i b ?, v s = 2.5v i b +, v s = 5v i b ?, v s = 5v f i gure 28. input b i a s current v s . t e mpe r ature fo r v a r i ous s u p p l i es voltage differential from v s (v ) temperature ( c) 05143-037 0.04 0.05 0.06 0.07 0.08 0.09 ?40 ? 25 ?10 5 20 35 50 65 80 95 110 125 +v s ? v out v s = 5v v s = 2.5v ?v s ? v out +v s ? v out ?v s ? v out f i g u re 29. o u t p ut s a t u r a t i on v s . t e mper at u r e f o r v a r i ous sup p l i es s u p p l y curre nt (ma) temperature ( c) 05143-038 2.0 2.2 2.4 2.6 2.8 3.0 ?40 ? 25 ?10 5 20 35 50 65 80 95 110 125 v s = 5v v s = 2.5v 3.2 v s = +3v f i gure 30. sup p l y current v s . t e mper at ur e f o r v a r i o u s sup p lies volta ge n o ise ( n v/ h z ) frequency (hz) 05143-044 1k 10k 100k 1m 10m 10 100 1 100 10 1k g = +10 f i gure 31. v o ltage nois e v s . f r eq uenc y curre nt nois e (pa/ hz) 100 1k 10k 100k 1m 10m 100m frequency (hz) 05143-045 1 10 100 g = +2 10 f i gure 32. cur r ent nois e v s . f r eq uenc y 0 10 20 30 40 50 60 70 80 ?4k ? 3k ?2k ? 1k 0 1 k 2 k 3 k 4 k count v offset ( v) 05143-047 v s = 5v n = 420 x = ? 260 v = 780 v f i gure 33. input o f f s et v o ltag e d i strib u tion
ada4851-1 rev. 0 | page 12 of 16 common-mode re j e ction (db) frequency (hz) 05143-020 1k 10k 100k 1m 10m 100m 1g v s = 5v ?120 ?110 ?9 0 ?5 0 ?3 0 ?7 0 ?100 ?6 0 ?4 0 ?8 0 f i gur e 3 4 . c o mm on-mo d e reje ct i o n r a tio ( c mrr) vs . f r e q ue nc y ?110 ?100 ?8 0 ?4 0 ?2 0 0 ?6 0 ?9 0 ?5 0 ?3 0 ?1 0 ?7 0 p o we r s u p p l y re j e ction (db) 100 1k 10k 100k 1m 10m 100m 1g frequency (hz) 05143-023 v s = 5v +psr ?psr f i gure 35. p o wer s u p p ly rej e c t ion ( p s r ) vs. f r equenc y
ada4851-1 rev. 0 | page 13 of 16 circuit description the ad a4851 -1 fea t ur es a hig h s l e w ra te in p u t s t a g e tha t is a tr ue sin g le-s u p pl y t o p o log y , ca p a b l e o f s e n s in g s i g n als a t o r be lo w t h e min u s s u p p l y ra il . th e ra il-t o-ra i l o u t p u t s t a g e ca n p u l l wi t h in 70 m v o f ei t h er s u p p l y ra il when dr i v in g ligh t lo ads a n d wi thin 0.17 v w h en dr i v in g 150 ?. h i g h s p e e d p e r f o r m a n c e is m a in ta in e d a t su p p l y v o l t a g es as lo w as 2.7 v . headro om consi d era t io ns this am plif ier is desig n e d fo r us e in lo w v o l t a g e syst em s. t o o b ta in o p t i m u m p e r f o r m a n c e , i t is usef ul t o un der s tan d t h e b e h a v i or of t h e am pl i f i e r a s i n put a n d output s i g n a l s a ppro a c h th e am p l if ier s headr o o m lim i ts. the ad a4851 -1 s in p u t co mm o n - m o d e v o l t a g e ra n g e ext e n d s f r o m t h e n e g a t i ve s u p p l y v o l t a g e ( a c t ual l y 200 mv b e lo w this), o r g r o u n d fo r sin g le-s u p p l y o p era t io n , t o wi t h in 2 v o f the p o si ti v e s u p p l y v o l t a g e . th er efor e , a t a ga in o f 2, th e ad a4851-1 ca n p r o v ide f u ll ra il-t o-ra il o u t p u t sw in g f o r s u p p l y v o l t a g e a s lo w as 3.6 v , a s s u m i n g t h e in p u t si gn al sw in g i s f r o m ?v s (o r gr o u n d ) t o +v s /2. a t a ga in o f 4, th e ad a4 851-1 can p r o v ide a ra il -t o-ra il ou t p ut r a nge dow n to 3 v tot a l su pply volt age. e x ce e d in g t h e he adr o o m li mi t i s n o t a con c er n fo r a n y in v e r t ing ga in o n an y su pply v o l t a g e, as lo n g as t h e r e fer e n c e v o lt a g e a t t h e am plif ier s p o si t i v e in p u t lie s wi t h i n t h e a m plif ier s in p u t co mm o n -m o d e ra n g e . the i n p u t st a g e is t h e h e adr o om limi t fo r sig n als wh e n t h e a m plif ier is us e d in a ga i n o f 1 fo r sig n a l s a p p r o a chin g t h e p o si t i v e ra i l . f i g u r e 36 sh o w s a t y p i cal o f fs et v o l t a g e vs. t h e in p u t co mm on-m o d e v o l t a g e fo r th e ad a4851 -1 a m p l if ier o n a 5 v su p p ly . a c c u ra t e dc p e r f o r ma n c e is ma in t a ine d f r o m a p p r o x ima t e l y 200 m v be lo w t h e m i n u s su p p l y t o wi t h in 2 v o f t h e p o si t i v e su p p l y . f o r hig h s p eed sig n als, h o wev e r , t h er e a r e ot he r c o ns i d e r a t i o ns . f i g u r e 3 7 show s ? 3 d b b a nd w i d t h v s . d c in p u t v o l t a g e fo r a uni t y-g a in fol l o w er . a s t h e comm on- m o d e v o l t a g e a p p r o a ch es t h e p o si t i v e su p p ly , t h e a m pl if ier r e sp o n ds wel l , b u t t h e b a nd w i d t h b e g i ns to d r op a t 2 v w i t h i n + v s . 600 580 560 540 520 500 480 460 440 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 v os ( v) v cm (v) 05143-046 f i g u re 36. v os vs . co mmo n-mo de v o l t a g e , v s = 5 v ?6 ?5 ?4 ?3 ?2 ?1 0 1 gain ( d b) 0.1 10 1 100 05143-050 frequency (mhz) 2 1000 g = +1 r l = 1k ? v s = 5v v cm = 3.0v v cm = 3.1v v cm = 3.2v v cm = 3.3v f i g u re 37. u n it y- g a in f o l l ower bandwidth vs. input c o mmon-mode t h i s c a n m a n i f e st it s e l f i n i n c r e a s e d d i stor t i on or s e tt l i ng t i me. h i g h e r f r e q u e n c y s i g n a l s re qu i r e more he a d ro om t h an t h e l o we r f r e q u e nc i e s to m a i n t a i n d i stor t i on p e r f or m a n c e. f i g u r e 3 8 ill u s t ra t e s h o w t h e r i sin g e d g e s e t t lin g t i m e f o r th e am p l if ier co nf igur e d as a uni t y - gain fol l o w er st r e tch e s o u t as t h e to p o f a 1 v st ep i n p u t a p p r o a ch es and exce e d s t h e sp e c i f ie d in p u t co mm o n -m o d e v o l t a g e limi t. f o r sig n a l s a p p r o a chin g t h e mi n u s su p p ly an d in v e r t ing ga in a n d hig h p o si t i ve ga in co nf igur a t io n s , t h e h e adro o m limi t is t h e o u t p u t s t a g e . the ad a4851-1 am p l if iers us e a c o m m on emi t t e r output st age. t h i s output st ag e maximi zes t h e a v a i lab l e o u t p u t ra n g e , limi t e d b y t h e s a t u ra t i o n v o l t a g e o f t h e ou t p u t t r a n sist o r s. the s a t u ra t i o n v o l t a g e i n cr e a s e s wi t h t h e dr i v e c u r r en t t h e o u t p u t tra n sis t o r is r e q u ir ed t o s u p p l y , d u e t o t h e o u t p u t t r a n sis t o r s col l ec t o r r e sis t a n c e .
ada4851-1 rev. 0 | page 14 of 16 output voltage (v) time (ns) 05143-051 2.00 2.25 2.50 3.00 3.25 3.50 2.75 0 100 200 300 400 500 600 700 800 900 1k g = +1 r l = 1k ? v s = 5v v step = 2.25v to 3.25v v step = 2.25v to 3.5v, 4v, and 5v 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 0 1 02 0 3 04 0 5 0 6 07 0 8 09 0 1 0 0 output voltage (v) time (ns) 05143-052 3.6 v step = 2v to 3v v step = 2.1v to 3.1v v step = 2.2v to 3.2v v step = 2.3v to 3.3v v step = 2.4v to 3.4v g = +1 r l = 1k ? v s = 5v f i gur e 3 9 . p u l s e r e sp o n se o f g = 1 f o llo w e r , input step o v er lo a d ing the i n put stag e f i gure 3 8 . o u tput r i si ng e d ge fo r 1 v st ep a t input hea d ro om l i mi ts a s t h e s a t u r a t i on p o i n t o f t h e ou t p u t st a g e is a p p r o a ch e d , t h e o u t p u t sig n al sho w s in cr easing a m o u n t s o f com p r e s s io n a n d c l ippi n g . a s i n t h e i n pu t he a d ro om c a s e , h i g h e r f r e q u e nc y s i g n a l s re qu i r e a bit more he a d ro om t h an t h e l o we r f r e q u e nc y sig n als. f i gur e 14 il l u s t ra t e s t h is p o in t b y p l ot t i ng t h e typ i ca l d i stor t i on v s . t h e output a m pl itu d e. out p ut ou t p u t o v er lo ad r e co v e r y is ty p i cal l y wi thin 3 5 n s a f t e r t h e a m plif ier s i n p u t is b r o u g h t t o a n o n o v e rlo a ding va l u e . f i gur e 40 show s output re c o ve r y t r ans i e n t s f o r t h e am pl i f i e r re c o ve r i ng f r om a s a tu r a t e d output f r om t h e top a n d b o tt om suppl i e s to a p o in t a t midsupply . overload behavior and recovery ?2 ?1 0 1 2 3 4 5 6 0 1 02 0 3 04 0 5 0 6 07 0 8 09 0 1 0 0 inp u t and outp ut v o ltage (v ) time (ns) 05143-053 7 g = ? 1 r l = 1k ? v s = 5v input voltage edges v out = 5v to 2.5v v out = 0v to 2.5v inp u t the s p ecif ied in p u t co mm on-m o d e v o l t a g e o f th e ad a4851-1 is 200 m v be lo w the nega t i v e su p p l y t o wi t h in 2 v o f th e p o si t i v e s u p p ly . e x ce e d in g t h e to p limi t r e s u l t s i n lo w e r b a ndwi d t h and in cr e a s e d s e t t li n g t i m e , as s e en in f i gur e 37 a n d f i gur e 38. pus h in g t h e in p u t v o l t a g e o f a uni t y-ga in f o ll o w e r le s s th a n 2 v f r o m th e pos i ti v e s u p p l y lea d s t o th e b e h a v i or s h ow n i n f i g u r e 3 9 a n i n c r e a s i ng a m ou n t of o u t p ut er r o r as w e l l as m u ch i n cr e a s e d s e t t li n g t i me. th e r e co v e r y tim e f r o m in p u t v o l t a g es 2 v o r c l oser t o th e p o si t i v e su p p ly is a p p r o x ima t e l y 85 n s , which is l i mi t e d b y t h e s e t t lin g a r t i fac t s ca us ed b y t r a n sis t o r s in t h e in p u t s t a g e co min g o u t o f sa t u ra ti o n . the ad a4851 -1 do es n o t exhib i t p h as e rev e rs al , ev en fo r in p u t v o l t a g es b e yon d t h e v o l t a g e su pply ra i l s. g o in g m o r e t h an 0.6 v b e yo nd t h e p o w e r su p p lies t u r n s o n p r o t e c t i on dio d es a t t h e i n p u t s t a g e , wh ic h gr ea tl y in cr ea se t h e de v i ce s curr e n t d r a w . f i g u re 40. o v er l o a d r e c o ver y
ada4851-1 rev. 0 | page 15 of 16 outline dimensions 1 3 4 5 2 6 2. 90 bs c 1. 60 bs c 2. 80 b s c 1. 90 bs c 0. 95 b s c 0. 22 0. 08 10 4 0 0. 50 0. 30 0 . 1 5 ma x 1. 30 1. 15 0. 90 sea t i n g p l ane 1. 4 5 m a x 0. 60 0. 45 0. 30 pin 1 indicator compliant to jedec standards mo-178ab f i g u re 41. 6-l e ad s m a l l o u t l i n e t r ans i s t or p a ck ag e [so t - 23] (rj-6) di me nsio ns sho w n i n mi ll im e t e r s ordering guide model temperature r a nge package descri ption package outlin e branding ADA4851-1YRJZ-R2 1 ?40c to +125c 6-lead small ou tline transistor package (sot-23) rj-6 hhb ada4851-1yrjz-rl 1 ?40c to +125c 6-lead small ou tline transistor package (sot-23) rj-6 hhb ada4851-1yrjz-rl7 1 ?40c to +125c 6-lead small ou tline transistor package (sot-23) rj-6 hhb 1 z = pb-free part.
ada4851-1 rev. 0 | page 16 of 16 notes ? 2004 analo g de vices, inc. all rights reserve d . tra d em arks and registered tra d ema r ks are the prop erty of their respective owners . d05143C0 ? 10/04(0)

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